This so-called secret artwork will be going on display in Denver this month. It is all part of the "Secrets of the Deep" exhibit which will be showing at Clayton Lane Fine Arts gallery in Denver from Aug. 25 until Nov. 1.

"Secrets of the Deep" will feature sculpture and artwork from Dr. Seuss' never before seen personal collection.

"People feel they really are familiar with Dr. Seuss. They know who he is, but when they get a chance to peel back the skin per se and see what he was doing artistically, they really love seeing the whimsical, whacky, and wonderful artworks," Bill Dreyer, the curator of the Art of Dr. Seuss collection, told 9NEWS.

While Dreyer says many of the pieces are quite Seussian both in their look and their title, there are a few surprises for fans.

"You can expect to see works that you're familiar with, of course, from Dr. Seuss's most popular books. But really the core of this exhibition is geared towards the works that you're not familiar with. If you come down, I think you'll be quite surprised and entirely delighted with what you'll see there at the gallery," Dreyer said.